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NASA NTRS1984

A cometary ion mass spectrometer

The development of flight suitable analyzer units for that part of the GIOTTO Ion Mass Spectrometer (IMS) experiment designated the High Energy Range Spectrometer (HERS) is discussed. Topics covered include: design of the total ion-optical system for the HERS analyzer; the preparation of the design of analyzing magnet; the evaluation of microchannel plate detectors and associated two-dimensional anode arrays; and the fabrication and evaluation of two flight-suitable units of the complete ion-optical analyzer system including two-dimensional imaging detectors and associated image encoding electronics.

Shelley, E. G.↗

NASA NTRS1981

The energetic ion composition spectrometer /EICS/ for the Dynamics Explorer-A

The energetic ion composition spectrometer (EICS) on the DE-A spacecraft is a high sensitivity, high resolution (M/Delta M greater than 10 FWHM at focus) instrument. It covers the entire mass range from less than 1 amu/e to greater than 150 amu/e in 64 mass channels, at each of 32 energy per charge steps covering the range from 0 to approximately 17 keV/e. The measurements obtained from this instrument will be used primarily to investigate the coupling between the magnetosphere and the ionosphere via the auroral acceleration region. Additional uses of the data will be to investigate the ring current loss processes, the coupling of the dayside cusp particles to the magnetosheath, and the tracing of artificially injected ions.

Shelley, E. G.↗